The standard user license for Citrix Virtual App and Desktop is Concurrent and user/device licenses. Choosing the correct license for a Citrix environment can be both confusing and stressful, especially when user device licences are half the price of concurrent licences.
The license allocation for user/device is 90 days and it cant be assigned to another user until 90 days of inactivity. Whereas concurrent license is only in use for the duration of the active session.
There will come a time when the user/device licenses will be exhausted, and users will receive an access denied error on login. To override this limitation, use the udadmin command to release the license manually.
1. launch the command prompt and navigate to the location of the udadmin command application. C:\Program Files(x86)\Citrix\Licensing\LS\
2. Use udadmin -list to find a user to delete and license type
3. To release a user/device license, delete a user from the license allocation list.
udadmin -user <user> -delete -f XDT_ENT_UD